IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. E. G. Fischer and his colleagues in ...

Ref: W. & L. E. Gurley, Manual of the Principal Instruments used in American Engineering and Surveying (Troy, N.Y., 1920), p. 70. Location Currently not on view Credit Line U.S. Department of ...